Multipole circuit breaker



July 20, 1954 'r. M. COLE EI'AL MULTIPOLE CIRCUIT BREAKER l0 Sheets-Sheet 1 Original Filed Aug. 8, 1944 y 1954 T. M. COLE ETAL 2,684,417

MULTIPOLE CIRCUIT BREAKER Original Filed Aug. 8, 1944 10 Sheets-Sheet 2 I \o W H HTTORNEYS July 20, 1954 Original Filed Aug. 8, 1944 T. M. COLE ETAL MULTIPOLE CIRCUIT BREAKER l0 Sheets-Sheet 3 I77TORNEYS July 20, 1954 Original Filed Aug. 8, 1944 T. M. COLE ETAL MULTIPOLE CIRCUIT BREAKER l0 Sheets-Sheet 4 l7 TTORNEYS y 1954 T. y. COLE ETAL 2,684,417

MULTIPOLE CIRCUIT BREAKER Original Filed Aug. 8, 1944 10 Sheets-Sheet 5 222 I Z24 l l l 56 g 57 /.5'6 INVENTORS HTTORNEYS y 1954 T. M. COLE ETAL MULTIPOLE CIRCUIT BREAKER 1O Sheets-Sheet 7 Original Filed Aug. 8, 1944 BY Q M k Cm9 M H T TORNE Y5 July 20, 1954 'r. M. COLE ETAL 7 MULTIPOLE CIRCUIT BREAKER Original Filed Aug. 8, 1944 10 Sheets-Sheet 8 w o 4 o E57. IL

l A TTORN E YS y 1954 i, M. COLE EIAL MULTIPOLE CIRCUIT BREAKER l0 Sheets-Sheet 9 Original Filed Aug. 8, 1944 ms M w III INVENTORJ E A -17 July 20, 1954 T. M. COLE ETAL 2,684,417

MULTIPOLE CIRCUIT BREAKER Original Filed Aug. 8, 1944 10 Sheets-Sheet l0 INVENTORJ THO 1H5 fi l-C 4,

BY WILLIAM H. HA T1 d-lu M E ATTORNEY Patented July 20, 1954 MULTIPOLE CIRCUIT BREAKER Thomas M. Cole, New York, N. Y., and William H. Lantz, J12, Newington, G0nn.,

assignors to Federal Electric Products Company, Newark,

Original applications Au 548,550, now Patent vember 8, 1949, and August gust 8, 1944, Serial No.

No. 2,487,637, dated No- 109,868, now Patent No. 25, 1953. Divided and 28, 1952, Serial N0. 30

16 Claims.

This invention relates to multi-pole circuit breakers and to tripping devices therefor. More particularly, the invention is concerned with a multi-pole circuit breaker which can be manually opened and closed and which is also opened automatically at all of the poles upon the occurrence of an overload in the circuit at any one 01' the poles.

In general, the circuit breaker is of the type disclosed in the application for Letters Patent of the United States, Serial No. 467,842, filed December 4, 1942, by Louis W. Cole and Thomas M. Cole, now Patent No. 2,421,839, issued June 10, 1947, and the tripping device of the present application is also, in general, of the type disclosed in said application.

The present invention will be fully understood from the following description considered in connection with the accompanying drawings illustrating the presently preferred embodiment of the invention.

In the drawings:

Fig. 1 is a perspective view of a circuit breaker embodying th present invention;

Fig. 2 is a fragmentary perspective view of the circuit breaker at the load side thereof;

Fig. 3 is a top plan View of a circuit breaker, with the casing cover removed;

Fig. 4 is a sectional view on the line l-4 of Fig. 3, the breaker being closed;

Fig. 5 is a sectional view on the line 5-5 of Fig. 3, but with the casing cover in place, the circuit breaker being tripped;

Fig. 5 is a sectional view on the line 6-43 of Fig. 3, but with the casing cover in place, showing the circuit breaker in the manually opened condition thereof and showing part of the tripping device in its said condition;

Fig. '7 is a bottom or rear plan view of the casing of the circuit breaker;

Fig. 8 is a sectional view on the line 88 of Fi .1;

Fig. 9 is a view on the line 9-9 of Fig. 8;

Fig. 1G is a sectional view on the line ill-49 of Fig. 3;

Fig. 11 is a sectional view on the line I 1-H of Fig. 10;

Fig. 12 is a perspective View of one of the spring projected holding members of the tripping device;

Fig. 13 is a perspective view of a lever device forming part of the means for resetting the tripping device following the tripping of the circuit breaker;

Fig. 14 is a perspective view of one of the 12, 1949, Serial No.

2,650,280, dated August this application August 7,224

2 members for holding the lever device illustrated in Fig. 13 on a companion pivot;

Fig. 15 is a perspective view of parts of the tripping device illustrated in separated but related positions with portions omitted for illustrative purposes;

Fig. 16 is a sectional view on the line Iii-l8 of Fig. 3, parts being omitted for the purpose or illustration;

Fig. 17 is a perspective view of the trip released means which also constitutes means for mechanically connecting certain of the contact members of the circuit breaker for conjoint operation;

Fig. 18 is a sectional view on the line I 3-13 01 Fig. 17;

Fig. 19 is a perspective view of certain of the parts illustrated in Fig. 17, said parts being shown in separated but related positions;

Fig. 2% is a sectional View on the line 2U2t of 15, parts being omitted for the purpose of illustration.

Referring to the drawings in detail, the hereinafter described tripping device and the operating parts of the switching unit of the circuit breaker are enclosed within a casing 58 provided with a cover l2, said casing and its cover being preferably molded from any suitable plastic, for example, Bakelite. A separately formed mounting unit M (Fig. 15), also molded or otherwise formed from a suitable plastic, is set into the casing at one end thereof as shown in Fig. 1 and is secured in position by screws l8 (Fig. 7) which extend through openings 28 in the bottom 22 of the casing and engage and thereby fasten the line terminal connecting members 251 in position. The terminal connecting members 24 are thus secured in mechanical and electrical engagement with companion terminal members 25, S and 39. Said terminal members 26, 23 and 3d are secured to the base 32 of mounting member I 4 by hollow pins 3:. which have their opposite ends flanged or peened over the companion terminal member and the bottom of base 32 of the mounting member as indicated at 36 and 38, respectively (Figs. 15 and 16). The openings to in hollow pins 3 register with the opening 2%) through which the screws it are entered for securing the terminal connecting members 24 in position. The mounting member M is provided with integral upstanding posts :22 which form barriers between the several terminal connecting members 2 and the adjacent portions or" the terminals 26, 23 and 3D. Said terminals will be subsequently more specifically described in explaining the construction of the tripping device.

The terminal connecting members Mi for the load side or" the circuit breaker are shown in Fig. 2, said terminal connecting members being fastened to the companion terminal members ie by screws 38 which are entered through openings 53 in the bottom of the casing (Figs. 6 and 7):. Barriers 52 integral with the casing It separate the terminals 5 and the load terminal connecting member it from each other. Openings. as are provided adjacent the four corners of the casing II for bolts 58 for removably fastening the cover I2 to the casing. Two of said openings -3 are for bolts by which the unit is fastened to a support, the holes for two other fastening bolts for securing the unit to a support being indicated at 5?.

The switching unit of the circuit breaker oomprises a one-piece manually operable member 58 molded or otherwise formed from insulating material, for example, Bakelite. Said member is positioned in the casing iii and extending transversely thereof between the opposite sides @8- of the casing. Manually operable member 58 has an arcuate segmental portion 62 from which an integral finger grip 66 extends for access externally of the casing through a slot 55 provided in the arcuate portion 58 of the cover I2. As illustrated in Fig. 6, the inner surface of the arcuate cover portion 68 lies adjacent, with slight clearance, to the segmental arcuate portion 62 of the manually operable member 53. Manually operable member 523 is mounted for pivotal movement in casing it by means of pivot pins IE3 and 72 which are fixed in the axially aligned end openings 75 and I6, respectively, by the milled or roughened pin-portions TI and 78. The circular heads 8t and S2 of pins 78 and I2 constitute trunnions and are received in bearing openings in bearing plates 8 which are mounted in vertical grooves 86 in the adjacent side walls til of the casing, said grooves being open at the top or front of the casing. Retaining plates 85 are held in position by the lower edges 81 of the side flanges 88 of the cover.

The manually operable member 58 has axially or laterally spaced integral web portions 96, 92, and 94. Contacts 38, one for each pole of the breaker or switch, are secured to said web portions, respectively. Contact members 98, we and W2, each in the form of a lever, are pivoted, respectively, on the end pins 78 and 12 and upon an intermediate pin it l which is formed of insulation. The insulation pin Hi l has a sliding fit in the intermediate openings I68 which are in axial alignment with the end openings M and '16. Pin 72 extends through an opening H33 and abuts the end of pin IIl-l, the opposite end of which is abutted by the end of pin 16. It will be understood that pin Hi4 and contact member Hi2 which is pivoted on said pin are assembled with the manually operable member 58 before one of the end pins it or if! and the companion contact member pivotally mounted thereon are mounted on said manually operable member. As pins i8 and F2 are preferably formed of steel or other metal, the insulation pin 1M insulates said first mention d pins from each other. it will be noted that the end pins ill and I2 are provided with circular bearing portions lit and II 2, respectively, between the shank and head portions of the respective pins to provide bearings for the contact members 98 and I96. Movement of contact members 98 and H30 axially of their pivots is prevented by the bosses H4 and H5 on the web portions to and 9 1, respectively, and by the adjacent surfaces of the bearing plates 84, while movement of the contact member Hi2 axially of its pivot pin 284 can not occur because said contact member fits, with a slight clearance, in the space between the web 82 and web H8. Webs l I8 and I 2i} provide barriers between the contact members at the several poles of the breaker and are provided with ribs I22 which fit with clearance in companion arcuate grooves [24, respectively, in the upper edges of upstanding projections I25 on the bottom or back wall of casing it. The contact members 98, we and I92 are biased for movement away from their respective companion contacts 9 by two springs, each of which has a coiled portion E28 (Figs. 4, 5 and 8) and end portions 436 and I32 which bear against the edge Hit of the arcuate portion 62 and against one arm or the companion lever contact members $23 and let, respectively, the spring engaged lever arms of said contact members 92 and H39 being indicated at 533 and I38, respectively, said springs acting on member M2 through the cross member M2 hereinafter described.

Contact members 98, Iiiil and it? are mechanically connected for joint operation by a rigid cross member Hi2: (Figs. 3 to 6 and 1'7). Cross member M2 also constitutes a trip released member, as will subsequently more fully appear in the explanation of the tripping device. In order to compensate for any inequalities in the engagement of the contact members 93, I M and I52 with their companion contacts 96, respectively, which are fixed to the manually operable member 58, provision is made for allowing a limited movement between the cross member and the lever arms E36, I38 and 549 of said contact members 98, iili! and H32, respectively. The means provided for this purpose is illustrated more clearly in Figs. 17 to 19, and by reference thereto, it will be noted that the cross member I52 is provided with a plurality of spaced openings Hill into which the laterally offset ends 5'45, Hi8 and i5@ of the contact member lever arms 53%, I33 and MI respectively, project. Figs. 18 and 19 illustrate the connection in respect to the offset end I45 of the arm 535 of the contact member 98, but it will be understood that each of the offset ends or the arms of the contact members are connected to the cross member 152 in the same manner. Thus, as illustrated, the end por tion Hi6 of arm I 3% is provided with a Sr ..ll arcuate opening or slot i52 through which a pr. pin Ih'i projects, said pivot pin passing through a pair of aligned openings in a bracket Hit, the opposite end portions ace of said pivot pin being bent around the companion bracket as illustrated in Fig. 17. Each bracket l53 projects into a companion opening Its in the cross member I42 and is held in position by a U-shaped clip 552 which engages the cross member Hi2 at the opposite sides thereof. More particularly, each U-shaped clip I52 is provided with a pair of aligned openings its in which the companion bracket I58 fits, each of said brackets having a pair or" outturned ends 5&5 which bear against the adjacent side I63 of the companion clip ltZ, it being understood that the outturned ends Hit of each bracket 553 are formed after the bracket is inserted through the companion openings 454 of the companion clip I62. Each clip is provided with a pair of inwardly directed struck-out tongues IIfl which engage the cross member M2 at the bottom of the opening I44 for securing the clip to said cross member. A spring I12 is positioned in each opening I44 and bears against the end M6, I48, or I50 of the companion contact member as illustrated in Fig. 18, for resiliently opposing movement between connecting member I42 and contact members 98, ltd and I02. It will be understood that cross member I42 is formed of insulation material so that the contact members are insulated from each other.

In the normal condition of the circuit breaker, cross member 42 is held against movement in a clockwise direction (viewing Fig. 4.) beyond a predetermined point by the spring projected members I14 of the tripping device which will hereinafter be more particularly described. When the cross member I42 is thus held against movement in a clockwise direction beyond the spring projected members I14, the circuit breaker can be manually opened and closed by pivotal movement of the manually operable member 58 in counterclockwise and clockwise directions, respectively (viewing Fig. 4), the closed condition of the circuit breaker being illustrated in Fig. 4 and the manually opened condition of the circuit breaker being illustrated in Fig. 6. Provision is made for engaging and disengaging the contact members 38, mo and I02 with their companion contacts 53, respectively, with a snap action, in the manual operation of the circuit breaker. For this purpose, the springs I'IG are provided. Each of said springs has an intermediate coiled portion Il8 and end portions I80 and I32. As shown in the drawings, there are 'two springs Hi5, the ends I86 of which engage in companion recesses I84, respectively, in the inner ends of the laterally spaced inwardly molded projections I85 (see Figs. 6 and '7). The other ends I82 of the two springs I16 engage the manually operable member 58 in notches I88 in the web portions 90 and 94 respectively (Figs. 4 and 6).

The tripping device for automatically opening the circuit breaker at all of the poles thereof upon the occurrence of an overload or predetermined current fiow at any one of the poles of the circuit breaker will now be described. As explained above, when the circuit breaker is manually closed, the cross member I42 engages the spring projected members I'M which in the projected positions thereof are in the path of movement of said cross member whereby the movement of the latter in a clockwise direction, viewing Fig. 4, beyond a predetermined point, is limited by the engagement of said cross member with said spring projected members. The latter are mounted for sliding movement in grooves #86 formed in the inwardly extending ledges I92 (Fig. 10) of the inwardly molded portions I9 3 of the casing. A spring 196 is positioned in each of said grooves for projecting the companion member El a and for opposing movement of the latter to its retracted position. Plates I93 of insulation material are secured to ledges I92 over spring projected members [14 by screws 199 or in any other suitable way and form, with the walls of the companion grooves I99, guideways for the spring projected members I14. Each of the spring projected members I'M is provided with an integral laterally extending arm 250 which is movable in a recess 2%2- (Fig. 11) in ledge I92 to allow movement of arm 21in when the spring projected member I'M which carries said arm moves in the companion groove I90 of said ledge.

Spring projected holding members I I4 are moved to their retracted positions against the force of springs I96 by and under the control of a trip releasing member 204, which is shown in perspective in Fig. 15. Said trip releasing member 2114 is formed of insulation material and is mounted for movement on a plurality of rods 206, there being as here shown three of said rods disposed in triangular relation. Said rods are fixed at their outer thread ends to the terminal members 26, 28 and 30, respectively. More particularly, as illustrated in Fig. 16, the central terminal member 28 has a portion 208 to which a companion rod 206 is secured. As illustrated in Fig. 15 the terminal member 30 has an upwardly directed portion 2I0 provided with a threaded opening for the securement thereto of another of said rods 265, while as illustrated in Fig. 16, the terminal member 26 has a similar upwardly extending portion 212 for the secure ment thereto of the third rod 208. Nuts 2I3 are provided on rods 255 for locking said rods to the companion terminal members. The relation of parts 268, 2:0 and 2I2 of the terminal members 28, 30 and 26, respectively, is illustrated more clearly in Fig. 20.

The trip releasing member is provided with recesses 2M into which the rods project, each of said recesses having an opening 2 I 5 surrounding the companion rod 205, said opening being somewhat larger in diameter than the rod so that the trip releasing member 204. not only can move longitudinally of said rods 285, but can also tilt thereon. A spring 2I8 is disposed in each recess 214 and bears at one end thereof against the inner end of said recess and at the opposite end thereof against the head 220 provided on rods 29%, as illustrated in Fig. 16. Thus trip releasing member 294 is spring retracted and is movable to a projected position against the force of the spring 2I8 in the recesses 2E4. A plurality of triangularly arranged retaining members 222, preferably formed of metal are securely fixed in trip releasing member 254, preferably in the molding of said trip releasing member. In the projected position of trip releasing member 204, said retaining members 222 are engaged adjacent their outer ends by triangularly arranged current responsive members 224 each of which consists of a bimetallic or thermostatic strip. The inner end of each bimetallic strip 224 is secured to the terminal member at the companion pole, and more particularly to the vertical part 288, 2M or 2I2 of the companion terminal, as illustrated in Fig. 16 with reference to the securement of the bimetallic strip 224 to the vertical portion 208 of the terminal member 28. For this purpose, the bimetallic strip 224 has a bent end portion 225 which is welded to the part 293, ME or 212 of the corresponding terminal member. In order to provide for the adjustment of the thermostatic strips 224 in relation to the ends of the companion retaining members 222 of the trip releasing member, the parts 288, 2H.) and M2 of the terminal members are provided with bent end portions 228, 236 and 232, respectively, each extending longitudinally of the companion thermostatic strip 224, as illustrated more clearly in Fig. 16. These end portions of the terminal members are each provided with an adjusting screw 233 in threaded engagement therewith and bearing on the companion thermostatic strip for adjusting the latter in relation to the companion retaining member 222 in a way obvious from the illustration. Each thermostatic strip 224 is electrically connected by a pig tail or other flexible conductor 234 to one of the contact members 98, M35 and 102. The stationary contacts 96 are connected to the companion terminals 45 at the load side of the breaker by similar flexible conductors or pig tails 236.

From the above description, it will be understood that upon the occurrence of an overload or other predetermined current flow at one or more poles, the corresponding bimetallic strip 224 through which the current passes will flex out of engagement with the companion retaining member 222 of the trip releasing member 204 whereby the latter will be moved to its retracted position by the springs 2H3. As the arms 2% of the spring projected holding members I14 are in the path of retractive movement of said trip releasing member 234, said arms are engaged by said trip releasing member during the movement of the latter to its retracted position and thereby the spring projected holding members i'd i are moved to their retracted positions to release the cross member Hi2 whereby to effect the tripping of the breaker. More particularly, when the spring projected holding members [14 are retracted, thereby releasing the cross member M2, the springs which engage or act upon the contact members 98, Hit and 82 move the latter clockwise, viewing Fig. 5, out of engagement with the companion contact members 96, respectively, until the forward arms of said first mentioned contact members engage the flange 238 at the forward edge of the arcuate part 82 of the manually operable member 58, and thereafter said contact members 98, ESE, ifiZ continue to move pivotally in the same direction together with the manual operating member until the finger piece 64 thereof engages the edge Me of the cover [2 at the slot '56. The opposite edge 242 of said slot is engaged by finger piece 6 of the manually operable member when the circuit breaker is manually opened, which is accomplished by moving said manually operable member in a counterclockwise direction, viewing Fig. 4, following the resetting of the breaker.

As indicated above, provision is made for resetting the breaker following the tripping thereof so that said breaker can be manually closed, For this purpose, the manually operable member 58 is provided with a cam 265% which cooperates with a cam operated lever device 246. As illustrated in Fig. 5, the cam 244 is formed as an integral part of the web 92 of said other manually operable member 58. The cam operated lever device 246, which is illustrated in perspective in Fig. 13, comprises the laterally spaced lever arms 248 and 25!] which are bent toward each other at their forward ends and welded in abutting face-to-face relation, as illustrated in Fig. 13, said forward ends 252 and 25% being appropriately contoured at their peripheral edges for operative engagement by the edge of cam 244 as illustrated in Fig. 5. Lever arms 248 and 250 of the cam lever device 246 are provided with arcuate bearing recesses 255 and 258 which engage arcuate bearing members 2% formed as molded projections on the bottom of casing 12 interiorly thereof, whereby said cam operated lever device 246 is mounted for pivotal movement in the casing. The arms 248 and 258 are held n pivotal engagement with the companion bearings 25!? of the casing by the retaining members 262 one or" which is shown in perspective in Fig. 14. Each of said retaining members comprises a downwardly extending arm 284 having a lower arcuate edge 266 which engages an arcuate edge portion 268 of the companion arm of the lever device 2% (Figs. 4 and 5). Also, the retaining member 252 comprises a cross bar 27!], a transverse dove-tail projection 272, and upstanding projections 21 and 218. The bars are of the two retaining members 262 are supported on the ledges 2'23 of the casing (Figs. 10 and 11) withv the transverse projections 2E2 fitting in correspondingly shaped dove-tail recesses 28!] formed in the casing portions let adjacent said ledges 278, respectively. The transverse end portions 282 and 28 2 of bar 273 of the retaining member 252 are positioned in correspondingly shaped recesses 285 and 252, respectively, while the upstanding portions 275 and 276 are positioned in vertical grooves 2% and 292, respectively, extending upwardly from the ledges 278 to the top of the ledges i522. The upper ends of parts 21 and 276 of the retaining members 262 are engaged by the plates 59% which overlie the spring projected holding members He. Thus, the retaining members 262 are held in fixed position in the casing and by engaging the arcuate portions 268 of the arms of the cam operated lever device 246 hold said arms in pivotal engagement on their companion bearings 2813. Longitudinally extending ribs 2% molded on the bottom of the casing interiorly thereof, and the adjacent longitudinally extending wall portions 256 of said casing provide grooves in which the lever arms 248 and 25B movably fit whereby said lever arms are held against movement toward or away from each other.

The lever arms 248 and 259 have vertical upstanding parallel portions 298 and 365, inwardly inclined portions 392 and 394 and forwardly inclined horizontal end portions 366 and 1558 which are positioned to engage the trip releasing memr 54 F 4, 5 and 10) for moving the latter, against the force of springs 2:3, to its projected or set position in which the ends of the bimetallic strips 224 engage the retaining members 222 of said releasing member 2%, when said bimetallic strips flex inwardly upon cooling thereof following the tripping of the circuit breaker. The breaker resetting operation takes place by moving the manually operable member 58 in a counter-clockwise direction, viewing Fig. 5, whereby the lever device 2% is pivotally moved also in a counter-clockwise direction by the engagement of the edge of the cam 2 3- 5 with the peripheral edge of the cam follower portion constituted by the ends 252 and 254' of the lever arms 248 and 250. It will be understood that the cam 2 24 and said cam follower of the cam operated lever device 2 36 are contoured so that the cross member i 42 of the switch unit moves upwardly beyond the spring projected holding members Ht before the trip releasing member 284 is moved sufliciently to release said spring projected members In for movement to their projected positions. In this connection it will be understood that when the manually operable member is moved counterclockwise for resetting the circuit breaker, the contact members 93, Ice and :02 are engaged by the flange 238 and are thus pivotally moved in a counter-clockwise direction to position the cross member 542 connected to said contact members upwardly or forwardly of the casing beyond the spring projected members lie. Thereafter the manually operable member is moved in a clockwise direction whereupon the cross member I 32 engages the spring projected members lit, thus holding the contact members 98, I89 and W2 stationary without, however, preventing the completion of the movement of the manually operable member in said clockwise direction, which does 9 not take place until the contacts 96 engage the companion contact members 98, Hill and H32, said contact engagement for closing the breaker occurring with a snap action as a result of the overcentering springs I18.

While we have shown and described the preferred embodiment of our invention, it will be understood that the latter may be embodied otherwise than as herein specifically illustrated or described and that in the presently preferred embodiment herein shown or described certain changes in the details of construction and in the arrangement of parts may be made without departing from the underlying principles of the invention within the scope of the appended claims.

This application is a division both of our applications, Serial No. 548,550, filed August 8, 1944, issued on November 8. 1949, as Patent No, 2,487,637, and of our application Serial No. 169,868, filed August 12, 1949, now Patent No. 2,650,280, issued August 25, 1953.

Having thus described our invention, what we claim and desire to secure by Letters Patent, is:

1. In a multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, and laterally spaced arcbarriers carried by said manually operable member in the spaces between the sets of companion contacts and contact members.

2. In a multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said membe in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, a casing in which said manually operable member is mounted, laterally spaced arc-barriers carried by said manually operable member in the spaces between said contacts, and laterally spaced wall portions carried by said casing in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members.

3. In a multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, and laterally spaced arcbarriers carried by said manually operable member in the spaces between the sets of companion contacts and contact members, said arc-barriers being integral with said manually operable member.

4. In a multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, a casing in which said manually operable member is mounted, laterally spaced arc-barriers carried by said manually operable member in the spaces between said contacts, and laterally spaced wall portions carried by said casing in registry with "lid b rs, respectively, and forming therewit l m aual arcchambers for adjacent sets or companion contacts and contact members, said arc-barriers being integral with said manually operable member.

5. A multi-pole circuit breaker comprising a one-piece manually-operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, means for mounting said manually-operable member for pivotal movement, coct members mounted for pivotal movement 00- l .liy with said manually-operable member but relative to the latt r and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, certain of said contact members being mounted on said mounting-means, and laterally spaced arc-barriers carried by said manually-operable member in the spaces between the sets of companion contacts and contact members.

6. A multi-pole circuit breaker comprising a one-piece manually-operable member carrying a pluralit of contacts, one for each pole, said con tacts being fixed to said member in laterally spaced relation, means for mounting said manually-operable member for pivotal movement, contact members mounted for pivotal movement co-axially with said manually-operable member but relative to the latter and positioned in 1at erally spaced relation for engagement with said contacts, respectively, when the breaker is closed, certain of said contact members being mounted on said mounting-means, and laterally spaced arc-barriers carried by said manually-operable member in the spaces between the sets or companion contacts and contact members, said arebarriers being integral with said manually operable member.

'7. A multi-pole circuit breaker comprising a one-piece manually-operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, means for mounting said manually-operable member for pivotal movement, contact members mounted for pivotal movement co-axially with said manually-operable member but relative to the latter and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, certain of said contact members being mounted on said mounting-means, said mounting means having parts projecting laterally beyond the opposite ends of said manually-operable frame, a frame for said breaker, parts removably mounted on said frame and having openings in which said projecting parts are engaged for supporting said manually operable member, laterally spaced arcbarriers carried by said manually-operable member in the spaces between said contacts, and laterally spaced wall portions carried by said frame in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members.

8. A multi-pole circuit breaker comprising a one-piece manually-operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, means for mounting said manually-operable member for pivotal movement, contact member mounted for pivotal movement coaxiall with said manually-operable member but relative to the latter and positioned in laterally spaced relation for engagement with sa d contacts, respectively, when the breaker is closed, certain of said contact members bein mounted on said mounting-means, said mounting means having parts projecting laterally beyond the opposite ends of said manually-operable member, a frame for said breaker, parts removably mounted on said frame and having openings in which said projecting parts are engaged for supporting said manually operable member, laterally spaced arc-barriers carried by said manually-operable member in the spaces between said contacts, and laterally spaced wall portions carried by said frame in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members, said arc-barriers being integral with said manually operable member.

9. In a multi-pole circuit breaker, a, manually operable member having a plurality of laterally spaced web portions each provided with a contact, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respec tively, when the breaker is closed, and additional laterally spaced web portions carried by said manually operable member in the spaces between the sets of companion contacts and contact members, said additional web portions constituting arc-barriers between said sets.

19. In a multi-pole circuit breaker, a manually operable member having a plurality of laterally spaced web portions each provided with a contact, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, and additional laterally spaced web portions carried by said manually operable member in the spaces between the sets of companion contacts and contact members, said additional web portions constituting arc-barriers between said sets, all of said web portions being integral with said manually operable member.

11. In a multi-pole circuit breaker, a manually operable member having a plurality of laterally spaced web portions each provided with a contact, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, and additional laterally spaced web portions carried by said manually operable member in the spaces between the sets of companion contacts and contact members, said additional web portions constituting arc-barriers between said sets, a casing in which said manually operable member is mounted, and laterally spaced wall portions carried by said casing in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members.

12. In a multi-pole circuit breaker, a manually operable member having a plurality of laterally spaced web portions each provided with a contact, contact members mounted on said manually operable member in relativel movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respec tively, when the breaker is closed, andadditional laterally spaced web portions carried by said manually operable member in the spaces between the sets of companion contacts and contact members, said additional web portions constituting arc-barriers between said sets, a casing in which said manually operable member is mounted, and laterally spaced wall portions carried by said casing in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members, all or said web portions being integral with said manually operable member.

13. In a multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, a casing in which said manually operable member is mounted, laterally spaced arc-barriers carried by said manually operable member in the spaces between said contacts, and laterally spaced wall portions carried by said casing in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members, said wall portions each having a groove defined therein, and said arc-barriers each having a portion which fits with clearance in a companion one of said grooves, respectively.

14. In a, multi-pole circuit breaker, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, a casing in which said manually operable member is mounted, laterally spaced arc-barriers carried by said manually operable member in the spaces between said contacts, and laterally spaced wall portions carried by said casing in registry with said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members, said wall portions each having a groove defined therein, and said. arc-barriers each having a portion which fits with clearance in a companion one of said grooves, respectively, said arc-barrier portions being integral therewith, respectively, and said arc-barriers being integral with said manually operable member.

15. In an automatic circuit breaker having a plurality of poles and mechanism for automatically opening the breaker at all of the poles upon the occurrence of an overload in the circuit at any one of the poles, a manually operable member carrying a plurality of contacts, one for each pole, said contacts being fixed to said member in laterally space relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, and laterally spaced arcbarriers carried by said manually operable member in the spaces between the sets of companion contacts and contact members.

16. In an automatic circuit breaker having a plurality of poles and mechanism for automaticany one Of the poles, a manually operable member carrying a plurality of contacts, One for each pole, said contacts being fixed to said member in laterally spaced relation, contact members mounted on said manually operable member in relatively movable relation thereto and positioned in laterally spaced relation for engagement with said contacts, respectively, when the breaker is closed, a casing in which said manually operable member is mounted, laterally spaced arc-barriers carried by said manually operable member in the i4 spaces between said contacts, and laterally spaced wall portions carried by said casing in registry With said barriers, respectively, and forming therewith individual arcing chambers for adjacent sets of companion contacts and contact members.

References Cited in the file of this patent UNITED STATES PATENTS 

